Furnace-door frame.



L. L. KNOX. FURNACE DOOR FRAME. APPLICATION rum) 111:0. 31 .1906

WITNESSES No. 864,752. PATENTED AUG, 27, 1907.

I L. L. KNOX.

FURNACE DOOR FRAME.

APPLICATION FILED DEG.31,1906.

' 4 SHEBTSSHEET 2 f9. 571K @QMK WW, s (13 No. 364,752. P'ATENTE'D AUG. 27, 1907.

FURNACE DOOR FRAME.

AYPLXOLTIOI FILED DBO. 31. W06.

4 SHEETB-SHBBT 3.

1515?; (a th m No. 864,752. PATENTED AUG. 27, 1907. L. L. KNOX.

FURNACE DOOR FRAME.

APPLICATION FILED DEO.81.1906.

4 BHBBTS-SHEET 4.

WITNESIES W/WZaIM 6% huluh flu, YMMV? g kp? 50 v in my pending application Serial No. 209,197 filed May Unrrnn STATES LUTHER KNOX, OF PIT'JSBUIME MURRAY AND UHF-FOURTH TO PENNSYLVANIA, ASSIGNOR if. E. WEISKOPF,

FURNACE-DOOR FRAME.

Specification of Letters Patent.

Patented Aug. 27 1 907.

Application filed December 31, 1906. Serial No. 350,219.

To all whom it may concern: Be it known that 1', LUTHER L. Knox, of Pittsburg, in the. county of Allegheny, Statelof Pennsylvania, I have invented a n ;w and useful Furnace-Door Frame, of which the following is a full, clear, and 'exact descrip tion, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is a vertical section showing my improved V door frame applied to an opendiearth furnace; Fig. 2 l is a front elcvutioii of the door frame, Fig. 3 is a similar i view showing a modification; Fig. 4 is a top plan view I of the frame shown in Fig. 3; Fig. this a vertical section I l on the line V-V of Fig. 3; and Fig. 6 is a detail sectional view showing one of the. detachable lastenings for the supplemental frame.

M y invention has relation to the classof furnace door frames, and is designed to provide a. frame which is so constructed that the portions thereof which are subject to destructive heat may be readily removed and re- I newed when burned out, the parts necessary to, be rcl ncwed in suchcases constituting but a relatively small part of the frame as a whole, so that the renewal may be I effected at a comparatively slight cost and without dismantling'the furnace or putting it out of commission.

My invention also comprises means whereby the parts of the door frame subject to destructive host may be protected by means of the circulation of a cooling fluid therethrough.

With these objects in view, my invention consists in a door frame having a main metallic member provided with a door-opening therein, and a. supplemental frame member arranged to fit within the said opening and to form a surrounding rim therefor, either wholly or in part, means being provided for circulating a cooling fluid within the supplemental frame member, and for detachably connecting it to the main frame member.

My invention also consists in the novel construction, arrangement, and combination of the parts, all substantially as hereinafter described and pointed out in the t appended claims. 1 In theidrawings, in which I have illustrated one ion of my invention the numeral 2 designates the brie liwork of an open-hearth furnace, 3 the door opening of the furnace, and ha part of the hearth or bottom thereof.

5 designates the main frame member which is provided with the lateral checks or flanges (5 and with the raised portion 7 adjacent thereto, said cheeks and raised portions forming guiding surfaces for a vertically sliding door. This door may be of any suitable character; but I have shown it as of the form described and claimed 23, 1904, in which it is composcd of a hollow body portion 8, a refractory backing 9, and a hollow surrounding rim portion 10 detachably secured to the body, suitable connections 11 being providcd for circulating the cooling fluid through the body and rim.

The main frame mcinbcro is l'orim-d with a door opening 12 which is somewhat largcr llmn the opening 3 of the furnace in order to rcccivc (herein the supplcmcm tal frame lnlnnber 13. This supplemental frame incinher is a rim-like structuriwhich fits within lhe marginal portion of the opcning 12 against the brickwork 2 of the furnace front, with its outer surface substantially flush with the outer surfaces of the raised portion 7. If desired the frame member 13 may be a solid casting of rim form. I prefer, however, to provide it with an intcrior watercirculatingspace. This may be effected by casting the rim in ho w form, with a dividing partition 14. to opposite sides of which lead the circulating pipes 15 and 16 respectively. These pipes may be convciiicntl y carried within a vertical channel or recess 17 of the frame member 5, of suflicient depth so that the door may freely slide over them.

The frame member 13 is detachabl y connected with the frame member 51 This may be effected in various Ways. In the drawings, I have shown it as prodded With lateral lugs l8 which seat within recesses l9 in the cheek portions 6 and are removabl-y secured therein by means of the keys or wedges 20. liy driving out these keys or wedges, the frame member 13 can be easily removed when necessary and a new member as readily inserted.

1n the modification shown in Figs. 3, 4 and 5, instead of making the supplemental frame member 13" in the form of a hollow casting, a water circulating pipe 2i is casttherein, the ends of this pipe being extended exteriorly of the casting, preferably at its upper port-ion.

to form the circulating connections 22 and 23. In order that there may be no place in the frame which is not equally protected by the cooling fluid, the embedded end portions of the pipe 21 are preferably crossed where they extend outwardly to form the circulating connections, asshown in dotted lines in Fig. 3.

The advantages of my invention result from the provision of the comparatively light and inexpensive supplemental frame-member, which can be readily removed and replaced when burned out, and which constitutes the only portion of the door frame which is exposed to destructive heat. Heretof0re,- these frames.

have been constructed in a single piece, and when burned out at any-portion thereof, it has been necessary to replace the entire frame. This is not only expensive, but it necessitates the stopping of the furnace while the rci'iewal is being made. By making the rim portion of the frame in a separate renewable piece, and by the provision of means such as described for protecting this piece by the circulation ofa cooling fluid, I reduce to a minimum the delays and expense of keep- 

